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Research Article

Mn single-atoms decorated CNT electrodes for high-performance supercapacitors

Qian Rong1, Chao Yuwen2, Yingkai Liu1( ), Yuanrong Liu1, Chunyang Wang3, Yang Wang4, Ding Zhang4( ), Zhen Wen5( )
Yunnan Key Laboratory of Opto-Electronic Information Technology, Institute of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
School of Materials Science and Engineering, National Institute for Advanced Materials, Smart Sensing Interdisciplinary Science Center, Nankai University, Tianjin 300350, China
Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China
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Graphical Abstract

The integration of Mn atoms into the carbon nanotube (CNT) can enhance the charge transport capacity and the number of polar active sites of Mn-CNT and then facilitate chemical interactions between Mn-CNT and OH−, which thereby significantly improve the capacity and long-cycle stability of supercapacitors.

Abstract

Developing highly robust and efficient electrode materials is of critical importance to promoting the energy density of current supercapacitors for commercialization. Herein, we report an efficient catalyst with monodispersed Mn single-atoms embedded in carbon nanotubes (Mn-CNTs) for enhancing the electrode performance of supercapacitors. A high specific capacitance (1523.6 F·g−1 at 1.0 A·g−1) can be achieved, which is about twice as high as the specific capacitance of the electrode material without the introduction of Mn single-atoms. Remarkably, the asymmetric electrochemical capacitor created with Mn-CNT and activated carbon exhibits a high energy density of 180.8 Wh·kg−1 at a power density of 1.4 kW·kg−1, much higher than most reported results. The study shows that the integration of Mn atoms into the CNT can enhance the charge transport capacity and the number of polar active sites of Mn-CNT and then facilitate chemical interactions between Mn-CNT and OH−. This work provides a novel strategy to enable high-energy storage in supercapacitors by introducing single-atoms into carbon nanotubes to improve electrodes’ energy density and cycle life.

Keywords

carbon nanotube (CNT)supercapacitorsingle-atomspower densityenergy density

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 4039-4046
DOI: 10.1007/s12274-023-6279-5
Cite this article:
Rong Q, Yuwen C, Liu Y, et al. Mn single-atoms decorated CNT electrodes for high-performance supercapacitors. Nano Research, 2024, 17(5): 4039-4046. https://doi.org/10.1007/s12274-023-6279-5
Topics:
CarbonSupercapacitor

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Received: 28 June 2023
Revised: 06 October 2023
Accepted: 19 October 2023
Published: 22 November 2023
© Tsinghua University Press 2023
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